Examples of com.dbxml.db.core.data.Value

com.dbxml.db.core.data.Value
Value is the primary base class for all data storing objects. The content window of Value objects are immutable, but the underlying byte array is not.

      private synchronized void split(Transaction tx) throws DBException, IOException {
         Value[] leftVals;
         Value[] rightVals;
         long[] leftPtrs;
         long[] rightPtrs;
         Value separator;


         short vc = ph.getValueCount();
         int pivot = vc / 2;


         // Split the node into two nodes

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                        if ( leftIdx < 0 )
                           leftIdx = -(leftIdx + 1);
                        if ( rightIdx < 0 )
                           rightIdx = -(rightIdx + 1);
                        for ( int i = 0; i < ptrs.length; i++ ) {
                           Value testValue = getIndexValue(values[i]);
                           if ( i >= leftIdx && i <= rightIdx && query.testValue(testValue) ) {
                              Value extraValue = getExtraValue(values[i]);
                              callback.indexInfo(testValue, extraValue);
                           }
                        }
                        break;


                     case IndexQuery.NEQ:
                        if ( !compoundVals ) {
                           for ( int i = 0; i < ptrs.length; i++ )
                              if ( i != leftIdx )
                                 callback.indexInfo(values[i], null);
                           break;
                        }
                        // The fall through is intentional


                     case IndexQuery.NBWX:
                     case IndexQuery.NBW:
                     case IndexQuery.NSW:
                        if ( leftIdx < 0 )
                           leftIdx = -(leftIdx + 1);
                        if ( rightIdx < 0 )
                           rightIdx = -(rightIdx + 1);
                        for ( int i = 0; i < ptrs.length; i++ ) {
                           Value testValue = getIndexValue(values[i]);
                           if ( (i <= leftIdx || i >= rightIdx) && query.testValue(testValue) ) {
                              Value extraValue = getExtraValue(values[i]);
                              callback.indexInfo(testValue, extraValue);
                           }
                        }
                        break;


                     case IndexQuery.LT:
                     case IndexQuery.LTE:
                        if ( leftIdx < 0 )
                           leftIdx = -(leftIdx + 1);
                        for ( int i = 0; i < ptrs.length; i++ ) {
                           Value testValue = getIndexValue(values[i]);
                           if ( i <= leftIdx && query.testValue(testValue) ) {
                              Value extraValue = getExtraValue(values[i]);
                              callback.indexInfo(testValue, extraValue);
                           }
                        }
                        break;


                     case IndexQuery.GT:
                     case IndexQuery.GTE:
                        if ( rightIdx < 0 )
                           rightIdx = -(rightIdx + 1);
                        for ( int i = 0; i < ptrs.length; i++ ) {
                           Value testValue = getIndexValue(values[i]);
                           if ( i >= rightIdx && query.testValue(testValue) ) {
                              Value extraValue = getExtraValue(values[i]);
                              callback.indexInfo(testValue, extraValue);
                           }
                        }
                        break;


                     case IndexQuery.NIN:
                     default:
                        for ( int i = 0; i < ptrs.length; i++ ) {
                           Value testValue = getIndexValue(values[i]);
                           if ( query.testValue(testValue) ) {
                              Value extraValue = getExtraValue(values[i]);
                              callback.indexInfo(testValue, extraValue);
                           }
                        }
                        break;
                  }
                  break;


               default:
                  throw new BTreeCorruptException("Invalid Page Type In query");
            }


         }
         else {
            // No Query - Just Walk The Tree
            switch ( ph.getStatus() ) {
               case BRANCH:
                  for ( int i = 0; i < ptrs.length; i++ )
                     getChildNode(tx, i).query(tx, query, callback);
                  break;


               case LEAF:
                  for ( int i = 0; i < values.length; i++ ) {
                     Value testValue = getIndexValue(values[i]);
                     Value extraValue = getExtraValue(values[i]);
                     callback.indexInfo(testValue, extraValue);
                  }
                  break;


               default:

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   public String getPattern() {
      return pattern;
   }


   private Value getCombinedValue(Value value, Key key, int pos, int elemID, int attrID) {
      Value result;
      try {
         int valSize = value.getLength();
         int keySize = key.getLength();
         int totalSize = valSize+keySize+16;


         byte[] b = new byte[totalSize];


         System.arraycopy(value.getRawData(), value.getOffset(), b, 0, valSize);
         System.arraycopy(key.getRawData(), key.getOffset(), b, valSize+1, keySize);


         int l = valSize+keySize+2;


         ByteArray.writeInt(b, l, pos);    // Write the pos
         ByteArray.writeInt(b, l+4, elemID); // Write the elemID
         ByteArray.writeInt(b, l+8, attrID); // Write the attrID
         ByteArray.writeShort(b, l+12, (short)valSize);


         result = new Value(b);
      }
      catch ( Exception e ) {
         result = null; // This will never happen
      }
      return result;

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   public void remove(Transaction tx, String value, Key key, int pos, int elemID, int attrID) throws DBException {
      String[] set = getReducedSet(value);
      for ( int i = 0; i < set.length; i++ ) {
         try {
            Value cv = getCombinedValue(new Value(set[i]), key, pos, elemID, attrID);
            removeValue(tx, cv);
         }
         catch ( DBException d ) {
            throw d;
         }

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   public void add(Transaction tx, String value, Key key, int pos, int elemID, int attrID) throws DBException {
      String[] set = getReducedSet(value);
      for ( int i = 0; i < set.length; i++ ) {
         try {
            Value cv = getCombinedValue(new Value(set[i]), key, pos, elemID, attrID);
            addValue(tx, cv, MATCH_INFO);
         }
         catch ( DBException d ) {
            throw d;
         }

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            continue;


         if ( stemmer != null )
            s = stemmer.stemWord(s);


         vals[i] = new Value(s);
      }


      // Now issue the query
      final List results = new ArrayList(128);

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   public static Value getIndexValue(Value value) {
      byte[] b = value.getRawData();
      int pos = value.getOffset();
      int len = value.getLength();
      int valLen = ByteArray.readShort(b, (pos+len)-2);
      return new Value(b, pos, valLen);
   }

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      int pos = value.getOffset();
      int len = value.getLength();
      int valLen = ByteArray.readShort(b, (pos+len)-2);
      if ( valLen < len-2 ) {
         // Take into account the null separator
         return new Value(b, pos+valLen+1, (len-valLen)-3);
      }
      else
         return EmptyValue;
   }

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      this.op = op;
      if ( op == SW || op == NSW ) {
         byte[] b = new byte[val1.getLength() + 1];
         System.arraycopy(val1.getData(), 0, b, 0, b.length - 1);
         b[b.length - 1] = (byte)0xFF; // Was 127
         Value val2 = new Value(b);
         vals = new Value[]{val1, val2};
      }
      else
         vals = new Value[]{val1};
   }

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               Set stopWords = fidx.getStopWords();
               if ( stopWords != null && stopWords.contains(value) )
                  return null;
            }


            IndexQuery idxQry = new IndexQuery(pattern, node.operator, new Value(node.value));
            IndexMatch[] matches = idx.queryMatches(tx, idxQry);
            return QueryEngine.getUniqueKeys(matches);
         }
         else
            throw new ProcessingException("No FullText Index to support pattern '"+node.name+"'");

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